摘要
利用脱氯缩合聚合法合成了聚 ( 2 甲氧基 5 丁氧基 )对苯乙炔 (PMOBOPV)、聚 ( 2 甲氧基 5 辛氧基 )对苯乙炔 (PMOCOPV)和聚 ( 2 丁氧基 5 丁氧基 )对苯乙炔 (PDBOPV)、聚 ( 2 辛氧基 5 辛氧基 )对苯乙炔 (PD COPV) 4种发光材料。对反应体系的浓度、酸碱度、反应温度及时间等工艺条件和路线进行了细致的研究。结果表明 :反应物的纯度、含量对合成产物的产率和性能有较大的影响 ;碱性是影响脱氯缩合反应的关键因素 ;而反应温度和时间对缩合反应影响则相对较小 ,在一定温度下当反应时间达到一定阶段后其转化率基本不变。对合成材料的化学结构、物理性能和发光特性进行了表征和检测。结果显示 :非对称烷氧基取代PPV具有良好的溶解性、成膜性和稳定性 ;而对称性烷氧基取代PPV的溶解性和成膜性相对较差。以PMOBOPV为发光材料 ,采用旋涂工艺制作出单层和双层发光器件 。
After the first report of electroluminescence, EL, in poly(p-phenylenevinylene)(PPV)-based diodes, much effort has been devoted to the preparation of novel π-conjugated polymers in order to change the emission color and/or to increase the EL efficiency. At present the key research work for the ELDs still focus on the molecular design, synthesis and modification of luminescence materials. It is found that synthesis route, reaction conditions and raw materials used, all have strongly influence on the yield, solubility and luminescence of the product obtained. In this paper, four kinds of PPV derivatives with symmetrical and asymmetrical alkoxyl substitutes are prepared by dehydrochlorination process with p-methoxylphenol and p-diphenol as raw materials. The effects of synthesis route and reaction conditions are investigated in detailed. The molecular structure is characterized with IR, 1H-NMR and UV-Vis spectroscopy. The thermal stability and thermo performance are obtained for TGA curves. The PL and EL characteristics are examined through fluorescent spectroscopy. The results show that PMOBOPV and PMOCOPV have excellent solubility and filming forming, which are better than PDBOPV and PDCOPV. Finally a single layer and two layer light-emitting devices were fabricated with PMOBOPV as light-emitting layer and Alq 3 as electron transfer layer. The EL and PL are studied. It is indicated that for the single layer devices light-emitting voltage is 6V, the highest luminescence degree is 146cd/cm 2; for two layer devices the luminescence voltage is 4V,the luminescence degree is 900cd/cm 2 when applied voltage become 14V.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2002年第1期40-44,共5页
Chinese Journal of Luminescence
基金
国家科技部攀登计划基础项目基金资助项目
西安交通大学博士启动经费资助项目
